[mkgmap-dev] observation regarding "board ferry"

Hello list, An observation I made regarding the "board ferry" message. I made a short route that involves a ferry in simulation (non-GPS) mode, so the Garmin will travel on the map all by itself. - both OSM and native Garmin will stop at the beginning of a ferry route, probably waiting for the virtual boat to leave. - however, the Garmin shows an icon of a boat, while the OSM map just shows an arrow (turn right/turn left). Could "board ferry" be a sort of turn restriction? I'm happy to test random values, but don't know where to look or what to look for. Anyone? Best regards, Valentijn